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(from student in students group student by student.age into g select g).ToList().ForEach(g =>
{
richTextBox1.Text += g.Key + "\n";
foreach (Student stu in g)
{
richTextBox1.Text += stu.name + "," + stu.age + "," + stu.grade + "," + stu.number + "\n";
}
});
class Program
{
static void Main(string[] args)
{
List<Student> list = new List<Student>()
{
new Student{Name="aaa",ClassName="a",Age=20,StuNo="a001"},
new Student{Name="bbb",ClassName="a",Age=18,StuNo="a003"},
new Student{Name="ccc",ClassName="b",Age=20,StuNo="b001"},
new Student{Name="ddd",ClassName="b",Age=20,StuNo="b045"},
new Student{Name="eee",ClassName="c",Age=20,StuNo="c001"},
new Student{Name="fff",ClassName="c",Age=20,StuNo="c008"},
new Student{Name="ggg",ClassName="c",Age=20,StuNo="c050"},
new Student{Name="hhh",ClassName="c",Age=20,StuNo="c007"}
};
Dictionary<string, List<Student>> stuGroup = new Dictionary<string, List<Student>>();
foreach (Student item in list)
{
if (!stuGroup.Keys.Contains(item.ClassName))
{
stuGroup.Add(item.ClassName, new List<Student>());
}
stuGroup[item.ClassName].Add(item);
}
foreach (KeyValuePair<string,List<Student>> item in stuGroup)
{
Console.WriteLine("班级:"+item.Key);
foreach (Student stu in item.Value)
{
Console.WriteLine("姓名:" + stu.Name + "\t班级:" + stu.ClassName + "\t年龄:" + stu.Age + "\t学号:" + stu.StuNo);
}
}
Console.Read();
}
}
class Student
{
public string Name { get; set; }
public string ClassName { get; set; }
public int Age { get; set; }
public string StuNo { get; set; }
}
List<Student> testStr = new List<Student>();
//添加testStr 元素
IEnumerable<IGrouping<string, Student>> query = testStr.GroupBy(x => x.班级);
foreach (IGrouping<string, Student> info in query)
{
List<Student> sl = info.ToList<Student>();//分组后的集合
foreach (Student item in sl)
{
}
}